Llanelli
United Kingdom
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Llanelli, United Kingdom

In Llanelli, United Kingdom, in January, the average water temperature is 8.8°C (47.8°F). Note: Swimming in 8.8°C (47.8°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in January »

In Llanelli, United Kingdom, the average seawater temperature in February is 8.4°C (47.1°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in February »

With an average sea temperature of 8.3°C (46.9°F), March is the month with the coldest seawater in Llanelli, United Kingdom. Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in March »

In April, the average sea temperature in Llanelli, United Kingdom, is 9.7°C (49.5°F). Note: Swimming in 9.7°C (49.5°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique. Weather in April »

In May, the average sea temperature in Llanelli, United Kingdom, is 11.5°C (52.7°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in May »

In Llanelli, United Kingdom, the average seawater temperature in June is 13.7°C (56.7°F). Note: Swimming in 13.7°C (56.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique. Weather in June »

In Llanelli, United Kingdom, in July, the average water temperature is 15.8°C (60.4°F). Note: Swimming in 15.8°C (60.4°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F). Weather in July »

The month with the warmest seawater in Llanelli, United Kingdom, is August, with an average sea temperature of 16.8°C (62.2°F). Note: Swimming in 16.8°C (62.2°F) is not enjoyable for the majority. Weather in August »

In Llanelli, United Kingdom, in September, the average water temperature is 16.6°C (61.9°F). Note: Swimming in 16.6°C (61.9°F) is not enjoyable for the majority. Weather in September »

In Llanelli, United Kingdom, in October, the average water temperature is 15.3°C (59.5°F). Note: For most, swimming in 15.3°C (59.5°F) is not an enjoyable activity. Weather in October »

In Llanelli, United Kingdom, the average seawater temperature in November is 13.6°C (56.5°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in November »

In Llanelli, United Kingdom, in December, the average water temperature is 11.3°C (52.3°F). Note: Swimming in 11.3°C (52.3°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in December »

What month is the sea coldest in Llanelli?

March is the month with the coldest seawater, with an average sea temperature of 8.3°C (46.9°F).

When are the longest days in Llanelli?

The month with the longest days in Llanelli is June, with an average of 16.6h of daylight.

What is the month with the warmest sea water in Llanelli?

With an average sea temperature of 16.8°C (62.2°F), August is the month with the warmest seawater.

What is the month with the shortest days in Llanelli?

December has the shortest days of the year, with an average of 7.9h of daylight.
Average sea temperature - Llanelli, United Kingdom

The best month for swimming (with the highest average sea temperature) is August (16.8°C).
The coldest month (with the lowest average sea temperature) is March (8.3°C).

Average daylight - Llanelli, United Kingdom

The month with the longest days is June (Average daylight: 16.6h).
The month with shortest days is December (Average daylight: 7.9h).